Local file tampering via process-wide umask race
Published May 29, 2023 · Updated Jan 14, 2025
Race condition in libarchive through 3.6.2 allows local users to cause creation of world-writable directories during concurrent writes. In archive_write_disk_posix.c, overlapping archive_write_disk_header() calls change the process-wide umask to zero and restore it in an unsafe order, leaving it at zero. Concurrent use of the POSIX disk-writer API is required; resulting 0777 directories let low-privileged local users delete or rename contained files.
Summary
What happened
Race condition in libarchive through 3.6.2 allows local users to cause creation of world-writable directories during concurrent writes. In archive_write_disk_posix.c, overlapping archive_write_disk_header() calls change the process-wide umask to zero and restore it in an unsafe order, leaving it at zero. Concurrent use of the POSIX disk-writer API is required; resulting 0777 directories let low-privileged local users delete or rename contained files.
The record
- CVE
- CVE-2023-30571
- Published
- May 29, 2023
- Updated
- Jan 14, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-362
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- May 29, 2023CVE publishedPublication date reported by the CVE source.
- Jan 14, 2025Record updatedLatest update available in the CVE record.
Exploitability
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